zh-TW: Translate testing.md and update CODEOWNERS (#774)

Translate testing.md to zh-TW and update CODEOWNERS

.github/CODEOWNERS

@@ -14,4 +14,4 @@ po/tr.po @duyguisler
 po/zh-CN.po @suetfei @wnghl @anlunx @kongy @noahdragon @superwhd
 po/pl.po @jkotur @pawelpaa
 po/ru.po @istolga @baltuky
-po/zh-TW.po @edong @hueich @kuanhungchen @victorhsieh @mingyc
+po/zh-TW.po @edong @hueich @kuanhungchen @victorhsieh @mingyc @johnathan79717

po/zh-TW.po

@@ -540,7 +540,7 @@ msgstr ""
 
 #: src/SUMMARY.md:163
 msgid "Testing"
-msgstr ""
+msgstr "測試"
 
 #: src/SUMMARY.md:164
 msgid "Unit Tests"
@@ -8957,11 +8957,11 @@ msgstr ""
 
 #: src/testing.md:1
 msgid "# Testing"
-msgstr ""
+msgstr "# 測試"
 
 #: src/testing.md:3
 msgid "Rust and Cargo come with a simple unit test framework:"
-msgstr ""
+msgstr "Rust 和 Cargo 提供了一個簡單的單元測試 (unit test) 框架: "
 
 #: src/testing.md:5
 msgid ""
@@ -8969,6 +8969,9 @@ msgid ""
 "\n"
 "* Integration tests are supported via the `tests/` directory."
 msgstr ""
+"* 在你的程式碼的任何地方都可添加單元測試。\n"
+"\n"
+"* 整合測試 (integration test) 則可放置在 `tests/` 資料夾下。"
 
 #: src/testing/unit-tests.md:1
 msgid "# Unit Tests"
@@ -18486,4 +18489,4 @@ msgid ""
 "    }\n"
 "}\n"
 "```"
-msgstr ""
+msgstr ""